A rectangle has a width of 5 inches and a length of 9 inches. What will be the new dimensions of the rectangle after it is dilated by a scale factor of 3?

A dilation by a scale factor of 3 multiplies each dimension by 3. The width becomes 5 × 3 = 15 inches, and the length becomes 9 × 3 = 27 inches. So the new dimensions are 15 inches by 27 inches, choice C.

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